Felix Homann wrote:

2012/5/3 Clemens Ladisch clemens@ladisch.de:

...

USB playback also adds further latency by queueing the packets; the number of packets can be seen under "URBs" in /proc/asound/card?/stream0. (There are 1000/8000 packets per second at full/high speed.)

I'm getting "URBs = 2 [ 5 6 ]" for playback and "URBs = 8 [ 8 8 8 8 8 8 8 8 ]" for capture with the "old" streaming logic. What does it mean?

The queue length is 5+6 = 11 packets; at high speed, that's 11 / 8 kHz = 1.4 ms.

Regards, Clemens